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RRB Junior Engineer Stage 1 Model Papers 4
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© examsnet.com
Question : 22
Total: 99
Of the three numbers, the first is twice the second, and the second is twice the third. The average of the reciprocal of the numbers is 7/12. The numbers are:
20, 10, 5
4, 2, 1
36, 18, 9
16, 8, 4
Validate
Solution:
Let third number = x
then,
second number = 2x
first number = 4 x
According to question
(
1
x
+
1
2
x
+
1
4
x
)
3
=
7
12
∴
x
=
9
∴ first number
=
4
x
=
4
×
9
=
36
second number
=
2
x
=
2
×
9
=
18
third number
=
x
=
9
© examsnet.com
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